FLOOD05902

• County: Weld
• Community: Elizabeth
• Stream Name: Running Creek
• Basin: South Platte
• Title: Floodplain Information Report
• Date: 7/1/1979
• Prepared For: Elizabeth
• Prepared By: WRC Engineering, Inc.
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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CHAPTER XI
RECOM:1ENDEO DRAINAGE CRIT:ERIA

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Presently, th.> TOW'llof Elizabeth docs not have ordin..nces which define
drainage design ctiteri~ for new developments and for improving existing
facilities. The floodplain delinc~tions fDr Running Creek ~nd the Elizabeth
major drainageways define hazardous area. presently e~i8ting along these
drainsgewsys. Drainage criteria which wilt reduce future flood damages ,3
recoonended in this section of the .eport. !la.cd on the input received from
the town and county officials, drainage crite.ia is developed which allows
preparation of a master drainage plan for the town. A mast", drainage plan
will provide an orderly frame~ork of replacing and ~pgrading inadcG~ate exia-
ting facilities ss ~ell as facilitating new developments.

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Theobjectiveofestsblishingdrainagecriteriaistoreduccdrainage
syste", maintenance costs and to reduce flood hazards to property snd human
life. Constraints due to lack of construction fund availability are considered
in thc recow~ended improvements.

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The proposed drainage criteria guidelines arc based on s Consensus of the
r"spectiveparti"sprovi.dinginputandareaUlllnarized1nthefollo",ingststc-

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ments.

Itisrecommend..d[;hattheT"","C""ociladoptnewordinancestoimplc-

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mentthene",policies.

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A. Hydrologic Analysis - It is recommended tbat the reaults of this study
be used in the analysis of flooding potential and tbedeterminati.o nofflood
flows along tbe major drainase",ays. This will provide unifor~ity of design
throughout the town. Flood Ho"s for the 5-, 10-, 50-, and 100-yesr frequencies
eRn b~ d~t~rmJn~d by interpolation usin~ the discbarge data provided in Table-B.
flood flows fo< other frequencies can also be obtained by plotting th ,,5-,10-,
50-, and 100-year values on a frequency versus discbarge graph and reading the
desired intermediate frequency.

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For' hydrologic ;1naty,i. ;it locations othet than :dong the major dr"in"gc~
ways, lC is reCO""""nded that the procedures outlined In th" Soil CO"Mrvation
Service publication..nti.tled "Urban Hydrology for 5mall Wsters hcds"bcfoUo.....ed.

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